基于疲劳热耗散试验的金属温度场分析方法  

Analytical method of metallurgical temperature field based on heat dissipation of fatigue process

作　　者：陈维维[1] 薛红前[1] 封硕[1] 

机构地区：[1]西北工业大学现代设计与集成制造技术教育部重点实验室,西安710072

出　　处：《锻压装备与制造技术》2014年第4期103-108,共6页China Metalforming Equipment & Manufacturing Technology

摘　　要：本文以300M钢的疲劳试验为基础,借助非接触式红外热像仪,观察了疲劳测试过程中温度场的变化,以热力学第一定律和热交换定律为基础,综合了G.Meneghetti的单位体积金属热耗散模型;从微观角度分析了不同热处理条件下300M钢微观晶粒度对疲劳损伤过程中温度变化的影响,从宏观角度考虑了载荷和循环周次与疲劳过程中试件温度变化的关系,通过多元函数逼近建立了以晶粒度、载荷水平、循环周次为自变量的当量热源模型描述热源。该模型可以通过插值的方法来快速定量确定金属表面的温度场和当量热源大小。最后,数值模拟该热源的效能,通过实验验证,发现该模型可以有效预测疲劳损伤过程中温度场的演化。Based on the fatigue test of steel 300M, with the aid of non-touching thermal infrared imager, the changes of the temperature during the process of fatigue test have been observed. On the basis of first law of thermodynamics and the law of heat exchange, the G.Meneghetti＇s model of metal heat dissipation per unit volume has been unified. The influence of microcosmic grain size of steel 300M steel to temperature changes has been analyzed during the process of fatigue damage under the different heat treatment conditions from microcosmic respect. Meanwhile, from macroscopic perspective, the relationship between loading, number of cycles and the temperature changes of the specimen of a fatigue test has been studied. Furthermore, a model of equivalent heat source which describes the heat sources has been established by the approximation method of taking the grain size, loading grade and fatigue life as variables. With the method of interpolation, this model can quantitatively determine temperature field on the surface of metal and the temperature of equivalent heat source. Finally, a numerical simulation has been executed to test the effect of the heat source. The model＇s capability of predicting the changes of temperature field during fatigue process has been verified by the experiments.

关 键 词：温度场 疲劳热耗散 当量热源 平均晶粒度 

分 类 号：TG115.57[金属学及工艺—物理冶金]